JPS6119353A - Cushion material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a cushioning material used in forming laminates and decorative laminates.

[Technical background of the invention and its problems] In recent years, copper-clad laminates have been widely used in the electronic and electrical industry.
Various types of decorative boards are also used in the field of architecture. In the heat-pressure molding of such laminates and decorative laminates, single or composite materials such as paper such as kraft paper and linter paper, felt, rubber, and glass cloth have been used as cushioning materials.

However, none of these could satisfy all of the properties required of a cushioning material, such as thickness accuracy, reproducibility, durability, and cushioning properties.

[Purpose of the Invention] The present invention has been made to solve these problems, and it has excellent thickness accuracy, reproducibility, and durability, as well as high heat dissipation in terms of heat conductivity, and allows for uniform heating and pressure molding. The purpose is to provide the best possible cushioning materials.

[Summary of the Invention] The cushioning material of the present invention is produced by laminating metal plates or metal foils and nonwoven fabrics made of plastic fibers alternately so that the nonwoven fabrics are adhered to both sides of the metal plate or metal foil, respectively. It is characterized by being made by gluing the spaces between them.

In the present invention, the metal plate or metal foil includes iron, copper,
A plate or foil made of aluminum or the like can be used.

The thickness of these metal plates or metal foils is 70μ to 2+11
A range of 111 is desirable.

Further, as the nonwoven fabric to be alternately laminated with these metal plates or metal foils, it is desirable to use a nonwoven fabric with a thickness of 2 to 6 mm and made of m-fibers such as linear polyamide resin or polyester resin.

Furthermore, in the present invention, the metal plate or metal foil and the nonwoven fabric are laminated one or more times alternately while bonding their joint surfaces using an epoxy adhesive, and finally, the outermost layer is laminated one or more times. They are also laminated to form a non-woven fabric.

The cushioning material of the present invention configured in this manner is useful as a cushioning material during hot-pressure molding of laminates and decorative laminates. That is, 1q of prepreg is prepared by impregnating a thermosetting resin such as phenol resin, melamine resin, epoxy resin, polyimide resin, or unsaturated polyester resin into a base material such as kraft paper, linter paper, glass cloth, or plastic nonwoven fabric. By inserting the cushioning material of the present invention between the heat source and the mirror plate when stacking a number of sheets, sandwiching them between a pair of mirror plates, and forming them under heat and pressure, the appearance and properties of the cushioning material can be improved. A board is obtained.

[Embodiments of the invention] Examples of the present invention will be described below.

Example 1 As shown in the drawings, a cushioning material was manufactured by adhering nonwoven fabrics 2 made of polyamide fibers with a thickness of 4 nm to both sides of an iron plate 1 with a thickness of 21+111 via an epoxy resin adhesive layer 3.

Example 2.3 The same polyamide nonwoven fabric used in Example 1 was adhered to both sides of a 70 mm thick copper foil (Example 2) and a 1 m thick aluminum plate twice (Example 3) to form a cushion. manufactured the material.

Next, copper-clad laminates were manufactured using these cushioning materials.

That is, a glass cloth is impregnated with epoxy resin and B-
A required number of known prepregs heated and dried up to the stage were stacked with electrolytic copper foil on top and bottom, respectively, and sandwiched between a pair of mirror plates, and this was placed between the mirror plates and the 7-heat plate in Examples 1-
1 with the cushioning material obtained in step 3 inserted.
A copper-clad laminate was manufactured by heating and pressing at 70°C and 30?1/cn for 1 hour.

Table 1 shows the properties of the obtained copper-clad laminate. For comparison, asbestos-containing kraft paper (Comparative Example 1), linter paper (Comparative Example 2), felt (Comparative Example 3), and felt-rubber composite (Comparative Example 4) were placed between the mirror plate and the heat source. A copper-clad laminate was produced in the same manner as in the example.

The properties of the laminate thus obtained are also shown in Table 1.
.

Furthermore, decorative boards were manufactured in the following manner using the cushioning materials of Examples 1 to 3 and Comparative Examples 1 to 4, respectively.

That is, a predetermined number of sheets of prepreg made by impregnating phenolic resin into kraft paper and drying it by heating are stacked with printed paper on top and bottom, respectively, which are sandwiched between a pair of mirrored plates, and the cushioning material is placed between the heat source and the mirrored plates. A phenolic resin decorative board was produced by applying a temperature and pressure of 180° C. and 120 kO/cd to the laminate for 1 hour with the laminates inserted.

Table 2 shows the properties of the decorative board obtained.

In addition, in Tables 1 and 2, regarding the edge sag of plate thickness, O indicates that the difference in thickness between the center and edge is less than 10/100, and 10/100 to 19/100. △
Those exceeding 19/100 are indicated by ×, and regarding the service life, those whose number of repeated uses is 100 or more are indicated by O, those which are used 50 to 100 times are indicated by △, and those which are less than 50 times are indicated by xr. Ta.

[Effects of the Invention] As is clear from the above examples, the cushioning material of the present invention has a core made of a metal plate or metal foil with excellent thickness accuracy and reproducibility, and has excellent cushioning properties and good durability on both sides. Since the plastic non-woven fabric is bonded, a void-free laminate or decorative board with a uniform thickness can be molded under heat and pressure. It can also be used repeatedly many times.

Furthermore, since the metal plate or metal foil serving as the core has extremely excellent heat conductivity, the heat dissipation property as a whole is high. Therefore, it is possible to disperse the influence of the steam piping in the heat source during hot press molding, and to produce a laminate or the like that is uniformly hot press molded without traces of the piping.

[Brief explanation of drawings]

The drawing is a cross-sectional view of the cushion material obtained in Example 1 of the present invention.

Claims (1)

[Claims] (1) A metal plate or metal foil and a nonwoven fabric made of plastic fiber are alternately laminated and bonded between them so that the nonwoven fabric is adhered to both sides of the metal plate or metal foil, respectively. Cushion material.